package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;
import org.springframework.util.StringUtils;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.ws.WebFault;
import java.io.IOException;

/*
* 检查用户是否已经登录
* */
@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request=(HttpServletRequest)servletRequest;
        HttpServletResponse response=(HttpServletResponse)servletResponse;
        log.info("过滤器已经启动: {}",request.getRequestURI());
//        1、获取本次请求的URI
        String requestURI = request.getRequestURI();
        String[] urls=new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/login",
                "/user/sendMsg"
        };
//        2、判断本次请求是否需要处理
        boolean chaeck = chaeck(urls, requestURI);

//        3、如果不需要处理，则直接放行
        if (chaeck){
            log.info("本次请求不需要处理",request.getRequestURI());
            filterChain.doFilter(request,response);
            return;
        }
//        4、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("employee")!=null){
            log.info("用户已经登录，用户ID为：{}",request.getSession().getAttribute("employee")!=null);
            Long employee = (Long) request.getSession().getAttribute("employee");
            BaseContext.setThreadLocal(employee);
            filterChain.doFilter(request,response);
            return;
        }

        //        4.1、判断用户登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("user")!=null){
            log.info("用户已经登录，用户ID为：{}",request.getSession().getAttribute("user")!=null);
            Long user = (Long) request.getSession().getAttribute("user");
            BaseContext.setThreadLocal(user);
            filterChain.doFilter(request,response);
            return;
        }
        log.info("用户未登录");
//        5、如果未登录则返回未登录结果
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }
    /**
     * 路径匹配，检查是否需要放行
     *
     */
    public boolean chaeck(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
